... cracks,no air bubble,no impurity11 Sample for free Features of Silicone o rings:• Non-toxic and Pyrogen free raw ... sealing ring: has anti-aging, high temperature, water, etc. better Advantages for Silicone o rings:1. Excellent sealing2. odourless, tasteless and ... has good flexible, and good stability Disadvantages for Silicone o rings:Not suitable for use with concentrated acids and bases, organic ...